Pyramidal diffuser



FIG. 1 is a top and left front perspective view of a first embodiment of a pyramidal diffuser, showing our design;

FIG. 2 is a top plan view of the embodiment in FIG. 1;

FIG. 3 is a front side elevational view of the embodiment in FIG. 1, where each side view is identical to FIG. 3;

FIG. 4 is a bottom plan view of the embodiment in FIG. 1; and,

FIG. 5 is a bottom and left front perspective view of the embodiment in FIG. 1. 

The ornamental design for a pyramidal diffuser, as shown and described. 